Originally Posted by
Tartan
My Bernina sews well with whatever thread I throw at her. The only time I had a problem was with an expensive spool of YLI varigated thread for machine quilting. It formed a little lint ball behind the needle eye and broke. My favourite for piecing is Aurifil.
When it does that you're using a needle with too small of an eye. Try a topstitch 90/14 next time.